Just to rule out hardware issues:

smartctl --all on the SSD shows no sector reallocations, barely any
media wearout, no uncorrectable error count and barely any CRC errors
(9). I am just running a long self-test and will report back whether it
shows any errors.

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https://bugs.launchpad.net/bugs/1682402

Title:
  Running I/O heavy operation (cp) inside terminal in X server session
  will lock up entire system while running it in a TTY works fine

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